Seventy-nine members of several types of groups responded to questionnaires which detailed their goals and self-perceptions, and their expectations and perceptions of group leadership, norms, methods, and atmosphere. The questionnaires were administered near the beginning and again at the end (posttest N=69) of the group experience. The groups themselves were university counseling center therapy groups, beginning and continuing group process laboratory classes, and a sensitivity training microlaboratory. Separate factor analyses were computed for responses to each questionnaire, and the resulting factors identified interpretable dimensions of goals, selfperceptions, leadership, morms, methods, and atmosphere. Members of physically separate and ostensibly different groups were in fact found to differ along the dimensions identified, and an empirical characterization of each of the four groups was developed from the major differences along those dimensions. (Author)